LINK Gravity is not uniform. It varies geographically.
Didn't know that.
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This makes satellite orbits tricky to compute.
Coffeo
Level 8
Feb 28, 2020
1
They don't call it Rocket Science for nothing you know.. 
In general, the variance in the gravitational pull anywhere on Earth is pretty small. One of the variables necessary to calculate gravity is the radius (squared) from the center of the Earth to the object of interest. in general the greatest difference would be sea level to the top of Mt. Everest, 29,029 ft. When plugged into the gravity equation there is a difference, but in relative terms it pretty small.
t1nick
Level 8
Feb 28, 2020
1
Indeed, as I remember from my days in satellite operations, the oblateness of the Earth had a greater effect than the topography of a given region on LEOs. And as you say, it is minimal. Atmospheric drag, particularly during solar max (which has actually declined significantly from my days in this field) was the biggest reason for the need to occasionally apply Delta-v.
Just for fun do the math[wikihow.com]
I was just joking around. The link was just to show other commenters how easy it is.
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